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I installed wampserver 3.1.7 on Windows 8.1 64, and apache is showing the following message.
I have tried with newer versions of wampserver and the error persists, what changes is the word "isupper" which in version 3.1.0 is "islpha".
I already downloaded this file Pcre.dll from the site https://pt.dll-files.com/pcre.dll.html and replaces the original installation Pcre.dll in the same directory that is shown in the image. But still unsuccessful.
When consulting the apache error log, the following message appears
[28-May-2019 17:35:07 UTC] Apache variable "${INSTALL_DIR}" is not defined.
Can someone help me?
In httpd.conf is variable is set in the file, "define INSTALL_DIR". It is not correct for me to create this environment variable. The other procedures cited by you have already been performed
– Rafael Christófano